Byplay (noun)

Action or conversation that is secondary or peripheral to the main event or subject; a minor or incidental aspect of a situation.

Origin:

Derived from the phrase "by play" which means "play that occurs on the side".

Examples:

1. The byplay between the actors added a sense of humor to the performance.
2. The byplay between the politicians was not part of the official agenda.
3. The byplay between the characters in the movie was a source of subtle subtext.
4. The byplay between the athletes was a testament to their sportsmanship.
5. The byplay between the guests at the party was a sign of their comfort and familiarity with each other.